Give SxS distribution its own registration GUIDs.

chrome/installer/util/chrome_app_host_distribution.cc

Index: chrome/installer/util/chrome_app_host_distribution.cc
diff --git a/chrome/installer/util/chrome_app_host_distribution.cc b/chrome/installer/util/chrome_app_host_distribution.cc
index 1c4c0e13fcd0b119e3c52c65e31bbe65c7b2991c..be0fdf552d08df215c8c0ffc48bf3f858f9d6a17 100644
--- a/chrome/installer/util/chrome_app_host_distribution.cc
+++ b/chrome/installer/util/chrome_app_host_distribution.cc
@@ -38,6 +38,16 @@ string16 ChromeAppHostDistribution::GetBaseAppName() {
   return L"Google Chrome App Launcher";
 }
 
+string16 ChromeAppHostDistribution::GetBrowserProgIdPrefix() {
+  NOTREACHED();
+  return string16();
+}
+
+string16 ChromeAppHostDistribution::GetBrowserProgIdDesc() {
+  NOTREACHED();
+  return string16();
+}
+
 string16 ChromeAppHostDistribution::GetDisplayName() {
   return GetShortcutName(SHORTCUT_APP_LAUNCHER);
 }